Fed up with is correct
The word "fed" is a verb. It is the past tense of the verb "feed."
rain fed
Corn, Corn fed cattle, Corn fed people who were fed on Corn fed cattle.
Most likely they sell grain-fed (or "corn-fed") beef.
which fed is indus
fed
Of course they are fed. What they are fed depends on the species of the animal and the location of the farm in question.
'fed' is the conventional past form of 'feed'
corn fed corn fed corn fed
"Fed" has one syllable.
It can be, as in fed individuals, fed sheets. It is the past tense and past participle of the verb to feed.